A368195 a(n) is the number of numbers that can be obtained by replacing any positive number without leading zeros, say m, appearing in the decimal expansion of n by one of the divisors of m.

1, 2, 2, 3, 2, 4, 2, 4, 3, 4, 2, 7, 3, 6, 5, 8, 3, 9, 4, 6, 5, 6, 4, 11, 5, 8, 6, 10, 5, 8, 3, 8, 6, 7, 6, 13, 4, 8, 7, 8, 4, 11, 5, 10, 8, 9, 5, 15, 7, 6, 5, 8, 4, 11, 6, 12, 6, 8, 5, 12, 5, 8, 10, 12, 8, 14, 6, 12, 9, 8, 3, 13, 4, 7, 7, 10, 6, 12, 5, 10, 8

Offset

1,2

Comments

a(n) gives the number of terms in the n-th row of A368194.

Links

Rémy Sigrist, Table of n, a(n) for n = 1..10000

Rémy Sigrist, PARI program

Index entries for sequences related to decimal expansion of n

Formula

a(n) >= A000005(n).

Example

For n = 42: the 42nd row of A368194 contains 11 terms (1, 2, 3, 6, 7, 12, 14, 21, 22, 41, 42), so a(42) = 11.

Prog

(PARI) See Links section.

Crossrefs

Cf. A000005, A368194, A368314 (binary variant).

Sequence in context: A302051 A334080 A066800 * A218705 A193459 A114102

Adjacent sequences: A368192 A368193 A368194 * A368196 A368197 A368198

Keyword

nonn,base

Author

Rémy Sigrist, Dec 16 2023

Status

approved